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Investment Securities - Gross Unrealized Loss and Fair Value of Available-for-Sale Securities, Aggregated by the Length of Time (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 15,647 | $ 15,950
Less Than 12 Months, Unrealized Loss | (488) | (712)
12 Months or More, Fair Value | 21,142 | 21,726
12 Months or More, Unrealized Loss | (306) | (475)
Total, Fair Value | 36,789 | 37,676
Total, Unrealized Loss | (794) | (1,187)
U. S. Government Agency Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 7,245 | 7,079
Less Than 12 Months, Unrealized Loss | (255) | (421)
12 Months or More, Fair Value |  |
12 Months or More, Unrealized Loss |  |
Total, Fair Value | 7,245 | 7,079
Total, Unrealized Loss | (255) | (421)
U. S. Government Agency Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 8,402 | 8,871
Less Than 12 Months, Unrealized Loss | (233) | (291)
12 Months or More, Fair Value | 12,204 | 12,856
12 Months or More, Unrealized Loss | (244) | (345)
Total, Fair Value | 20,606 | 21,727
Total, Unrealized Loss | (477) | (636)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or More, Fair Value | 8,938 | 8,870
12 Months or More, Unrealized Loss | (62) | (130)
Total, Fair Value | 8,938 | 8,870
Total, Unrealized Loss | $ (62) | $ (130)

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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position twelve months or longer aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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